Your cube size will be highly dependent on the number of players you want to draft with
The original Birds of Paradise says Summon Mana Birds, and the original Llanowar Elves reads Summon Elves. That was because Magic's creator Richard Garfield wanted players to feel like powerful mages summoning creatures to fight for them not too far from what the the Final Fantasy video games do
The Dominaria Common lands (Geothermal Bog, Idyllic Beachfront, etc): The only other foils are from DMU, and these are sweet
For most players, build Wilhelt, the Rotcleaver it does everything the tribe wants (tokens, sacrifice, draw), the precon is widely available, and its the most forgiving to pilot
In addition, they polled low in our internal Rare Poll
Its the fastest way to draft on MTGA and to convert your gold and gems into cards, and its arguably better than buying Arena booster packs on the MTGA store